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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ef129e08d0092e1a6a81451ff1e5b66cbe621bbff940db57e6a747ca072425' 
  AND token = 'utO8AyJg2meo6KPTFLdNYrFxWcMI5YLYwDVy1vAsL88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}